Where can i get nitrous otherwise known as n2o/nitro/laughing gas. when i have it how do i use it to laugh?

Whipped cream cans contain nitrous and you can buy whipped cream makers ard chargers on amazon.com Just make sure not to inhale car grade nitrous because it is poisonous. Also don't suffucate of get frostbite dealing with chargers. Make sure that when you put whipped cream on a pie you don't hold the can right side up or only nitrous will come out and not the delicious whipped cream you want to eat.